High temperature deformation behaviour and processing maps of AZ81 magnesium alloy

摘要：

The hot compression deformation behavior of AZ81 magnesium alloy was studied with Gleeble-1500 thermal simulation machine at the strain rate of 0.003 ~ 3.0s-1 and temperature of 340 ~ 430 ℃. The results show that, the flow stress decreases when the deformation temperature increases and strain rate decreases; the peak stress increases with decrease of the temperature and the increase of the strain rate; the critical strain that comes into stable phase increases obviously. It is that the high temperature flow stress model of AZ81 magnesium alloy is constructed by introduceing Zener-Hollomon parameters, its average deformation activation energy is 169.48 kJ / mol. Processing maps of AZ81 magnesium alloy is also calculated and analyzed by the dynamic model of the material. Useing hot deformation processing maps, the flow instability zone is determined and the best process parameters access to the test parameters during hot deformation are as follow: thermal processing temperature range of 380℃ ~ 420℃, strain rate range of 0.01 ~ 0.03 S-1.

关键词： AZ81 magnesium alloy flow stress Constitutive model hot processing maps

作者: Liao Huimin Zeng Ming Long Siyuan Cao Han-xue

作者单位: College of Materials Science and Engineering, Xihua University, Sichuan Chengdu, 610039 College of M College of Materials Science and Engineering, Xihua University, Sichuan Chengdu, 610039 College of Materials Science and Engineering, Chongqing University ,Chongqing, 400030

会议类型: 国际会议

会议名称: 11th IUMRS International Conference in Asia(第十一届国际材联亚洲材料大会 IUMRS-ICA 2010)

会议地点: 青岛

会议语种:英文

页码: 168-175

在线出版日期: 2010-09-25（万方平台首次上网日期，不代表论文的发表时间）